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my guess would be sealskin, locally made. You see the leather part and the fur is inside.
– Kate GregoryMay 10 '18 at 14:27

@KateGregory - Yeah, sealskin makes sense. I wonder if there's a particular name used for mittens like this? Perhaps they just go by "mittens." :)
– Don BransonMay 10 '18 at 16:45

2

"Gauntlet extreme-cold mittens" is the style of mitten. They're popular in Canada, It's common to make them out of sheepskin. Couldn't tell you what his are made out of though.
– ShemSegerMay 11 '18 at 19:10